420 THE NURSERY-MANUAL 



Shortia. Diapensiacece. 



Propagated by seeds when they can be collected, by division 

 and runners. 



Sibiraea. Rosacece. 



As for spiraea, with which it is frequently united: seeds and 

 layers. 



Sicana. Cucurbitacece. 



Annual frost-tender vines, grown from seeds. 



Silene (Campion. Catchfly). Caryophyllacece. 



Propagated by seeds, division and cuttings. Seeds are some- 

 times sown in autumn, of the annual kinds, to insure early bloom. 



Silphium (Rosin Plant. Compass Plant). Composites. 

 Multiplied readily by seeds and by division. 



Sinningia. Gesneriaceoe. 



The only well-known member of the group is the gloxinia of 

 horticulturists, which see. 



Sisyrinchium (Blue-Eyed Grass). Iridacece. 

 Increased in spring by seeds and by division. 



Skimmia. Rutaceos. 



Increased by seeds, sown in fall or stratified, in a frame ; also by 

 layers, and by firm cuttings in heat. 



Skirret (Slum Sisarum). Umbelliferce. 



Increased by seeds, sown in spring or fall, offsets, or division of 

 the plants. 



Smilax (Green-Briar). Liliaceoe. 



Young plants are obtained by seeds, by layers, and by division. 

 For " smilax" or Boston-vine of florists, see Asparagus, page 244. 



Snapdragon : Antirrhinum. 



Sobralia. Orchidaceoe. 



Grown by division of strong plants when repotting. See Orchids. 



Solandra. Solanacece. 



Multiplied by seeds sown in spring ; by cuttings of firm young 

 shoots taken with a heel and placed in slight bottom heat. 



